Main technical indicators
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Power supply voltage: 220V±10% Container volume: 4300mlX2 only
Pump power: 120W pressure range: 0- 100kpa
Vibration motor power 30W External dimension: 530X500X360
Precautions for Use
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1. Before using the instrument, it should be determined that the supply voltage is 220V±10%, and there is a good grounding device.
2, after the negative pressure container is put into the pattern, the highest water quantity should be 3 centimeters below the barrel mouth. To waterproof suction pump caused damage.
3. If there is no pressure indication on the pressure gauge after opening the pump, shut down and start the pump after finding out the reason.
4. Vacuum pump is an internal precision part of the instrument. It is forbidden to disassemble without the permission of the manufacturer.
Instructions for use
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1. According to the T0701 asphalt mixture sampling method or take (or drill) asphalt mixture samples from the asphalt pavement. the quantity of samples shall not be less than the quantity specified below.
Nominal maximum particle size of aggregate in asphalt mixture (mm) Minimum number of samples (g)
2. the asphalt mixture is carefully dispersed, coarse aggregate is not broken, fine aggregate is dispersed to less than 6.4mm, if the mixture is hard, can be heated properly in the oven after dispersing, the general heating temperature does not exceed 60°C, the dispersed sample should be broken by hand, shall not be broken with hammer, to prevent aggregate from breaking, to prevent aggregate from breaking. When the sample is a non-dry mixture taken from the road surface, the electric fan should be used to dry it to a constant temperature before operation.
3, negative pressure container type A, pressure resistant glass, plastic or metal tank, volume greater than 1000ml, sealed cover, vacuum hose, connected with the vacuum pump.
B. Vacuum volumetric flask with a volume of more than 1000ml, with rubber plug and vent valve, connected with vacuum and rubber pipe and vacuum pump.
C. 4000ml pressure-resistant vacuum dryer, with rubber plug and vent valve, connected with vacuum hose and vacuum pump
4, negative pressure vessel calibration method: B, C type negative pressure vessel filled with 25°C±0.5°C water, (with glass plate cover to keep completely filled with water), correctly weigh the total mass of negative pressure vessel and water (nb)
5. When class A containers are used, all containers are immersed in a constant temperature water tank of 25°C±0.5°C, and the water mass of the containers (ml) is weighed.
6. Dry the negative pressure container and number it to take its quality.
7. Put the asphalt mixture sample into a dry negative pressure container, say the total mass of the container and asphalt mixture, and get the net mass of the sample ma. the mass of the sample shall be less than the minimum value specified above.
8. Fill the negative pressure container with water of about 25°C and immerse the mixture completely.
9. Connect the negative pressure vessel with the vacuum pump and vacuum gauge, start the vacuum pump, so that the vacuum degree reaches 97.3kpa (730mmHg) for 15Min±2min
10, and then strongly oscillate the negative pressure container, so that the water fully agitate the mixture, remove the remaining bubbles, every 2 seconds to shake several times, until no bubbles appear, in order to make the bubbles easy to remove, can be added in the water with 0.01% concentration of surfactant (such as 0.01g detergent per 100ml water).
11. When the negative pressure vessel adopts class A vessel, immerge in the constant temperature water tank which is kept warm to 25°C±0.5°C, about ten minutes later, weigh the water mass (m2) of the negative pressure vessel and asphalt mixture. When the negative pressure vessel adopts class B and C vessel on March 12, 2008, Immerse the container containing the asphalt mixture sample into a constant temperature water tank insulated to 25°C±0.5°C, take it out after about ten minutes, so that there is no air in the container, wipe the water outside the container, and weigh the total mass of the asphalt mixture sample of the container, water (mg)